living organisms filter out and breakdown waste materials, bacterial can clean up toxic spills such as oil spills. Natural and artificial wetlands to filter.

Pollution Prevention?

Recycle water, use less chemicals, prevent animal waste runoff.(or use water for irrigation instead of the waste), dispose of toxic wastes properly (not down the drain)

What is Kinetic energy?

Energy from movement

What is Potential energy?

Energy waiting to be used. It can be due to the position. Example- water stored in resevoir.

How can water be used to produce elctricity?

Hydroelectric power

How can you get Hyroelectric Power?

Build a dam across a river, hold back water and become a lake. (EPB)

Water can be released and moved downhill through...

turbines which is a type of kinetic energy.

Turbines can convert _______ energy into electricity

Kinetic

__% of the world's electricity is hydroelectric power. U.S. uses __% of that.

20% world
9% US

Pros of a dam?

clean, safe, efficient, water is free not expenisve, naturally recycles through water cycle, doesn't add air pollution.

Cons of a dam?

expensive to BUILD, fish can't migrate because dam is a barrier, homes & farms flooded, destroys historical sites, only works if land is suitable- you must have a valley and fast river, present organisms can't survive.

what is plate tectonics?

a theory based on Earth Science

why do volcanoes, earthquakes happen?

plate tectonics

true or false?
the continents were once one whole continent

true!!!

what is a theory
(hint) they can be wrong!

a great deal of evidence supported by predictions...blah blah blah!!! hehe

who first observed continental drift?

Frances Bacon

who proposed the idea of continental drift?

Alfred Wegener 1912

what was the one continent called?

Pangea

do scientists actually know how the continents got the way they do now?

no...but they can guess

what are some evidences from land features?

mountain chains, coal deposits, and glaciers

how is evidence from fossils explained?

they study the places that they found the fossils and traced it into a path of where the dinosaurs roamed

how do they explain evidence from climates?

a hot natured plant found in a cold climate must have grown near the equator